Expansion valve



Aug. 18, 1931. R. M. HvlD 1,819,370

EXPANSIQN VALVE l Filed Jn. 1o. 1951 I Patented` Aug. A18,1931 i UNrrEDsrA'rEs PATENT OFFICE Rasmus 1u. nvm, or onrcneo,l ILLINOIS EXPANSION'VALVE Application led January 10, 1931. Serial No. 507,899.

My invention relates to expansion valves lows head having an annularportion or for use in refrigerating machines and parflange 22, and atubular portion 23 that ticularly to -a novel construction havingengages the boss. A bellows 24 constructed numerous advantages, thatwill be pointed in the form of an annulus is secured at one Afr outhereinafter. end to the support 22 and at the lower end 5o Anvobject ofmy invention is to provide to a floating head having an annular por-V anexpansion valve of extreme simplicity and tion 25 and a tubular portion26 that proof very small size, one that can be cheaply jects upwardlyinto the space at the center manufactured and that is adapted forkwideof the bellows. A vrelatively strong spring variation in the capacity orvariation in 27 is interposed Ibetween the support and 55 pressures thatmay be handled. the head, a spring of suitable strength being Aparticular object is to provide a conselected to balance or off-set theexpected struction in which there are no levers used pressure oXeI'tcdon the exposed area oi the in actuating the valve, and in which allparts SHOWS head. This spring is of fixedl resistare symmetricallyarranged with the needle 3410, that 1S, 110 regulating mea-11S 'are prO-60 valve' as their axis. The conservation of Vldedf space isaccomplishedin a simple manner A glude Sleeve has a neck 28 which is that will beapparent, from the following pressed into the tubular portion 23 of thedescription.Y support, while the depending portion 29 2o My inventionwill be more readily underf VPIOJGCSS COWIlWLIdly and CtS 21S a guido 65Stood by reference t0 the, accompanying fOI the tubular pOItlOII 26 Ofthe head. The

drawings, in which: `neck portion 28 has an inwardly projecting Fig. 1is a plan view of a valve constructed Jalge 30 3115i the tubular portion26 has in accordance with my invention, and a Correspondmg flange 31. Tothese flanges Fig. 2 is a vertical sectional view thereof. iS Sellled bySOldeIIlg olwcldng, a SBCOIld 70 The illustrations on the originaldrawings bellows 32 that surrounds the needle valve filed herewith areintended to be double Seele, 18 and serves to seal the interior of thelarge that is, the illustrations are twice the size of bellows 24.. -theaotual device, The needle valve has a disc like head 33 In the drawingsI have shown a casing a margin of which underlies the flange 31 75comprising -a head 10 and a cup 11 in thread. of the bellows head, thedisc having suitable' ed, air-tight engagement, The head eenopenings 34thereon to permit the escape tains'an inlet passage 12 for the refriger-0f llqllldthat passes therethrough. ating liquid7 a pipe'nippleprojecting into The described parts may be constructed 35 the passagecarrying a screenll. The head as a unit and then merely threaded intothe 80 `also contains an outlet opening 14 in combOSS 2 1- 4 municationwith the low pressure space 15 Varlable spring pressure is exerted onthe lwithin the! cup. y lower end of the n'eedle valve by means of Thewall 16 dividing the passage 12 from the spring 35, the upper end ofwhich is 40 the low pressure chamber 15 contains a port Contained on acap 36, and the lower end. 85

17 controlled by a needle valve 18, and inwithin a Screw Socket v37 thatprojects ycidental guide and seal members 19-20. A through the lowerwall of the cup and is boss l21 surrounds the port` and acts as aadapted for actuation from the exterior of support for the valvecontrolling mechanism the casing. In order to seal the interior of aboutto be described. -This comprises abel:` the casing against any yescapearound the adjusting socket 37, I provide a third bellows 38, solderedat its upper end to the spring cap, and at its lower end to the upwardlyprojecting boss 39 on the cup. Thus the adjustment offthe spring may bechanged or the spring removed and replaced without unsealing the casing.

With the parts assembled as shown, with the low pressure chamber incommunica- 'tion with the evaporation chamber of a resupplied by thespring 35, the regulation of` which force is effected from the'exteriorof .the casing. By this meansv a ywide varial limited except tion inpressures may be handled without change in the proportions ofthepar'ts.l

The construction as described may be very f simply manufactured andassembled, and is .adapted to handle any pressures on the low side,rom'20 lbs. above atmospheric to 25` inches of mercury below atmosphericl.All

the parts are symmetrical about the needle valve, thereby avoidingunevenness of valve wear, and conservingy space to the greatest extent.Obviously the construction is dapable of some modification, and l do notwish to be as indicated in the appended claims.

l claim:

l. ln combination, a casing, a wall therein providing low and highpressure chambers, said wall having a port, a needle valve controllingsaid port, a bellows in the low pres.- sure chamber, said bellows havingan axial opening, one end of the bellows being hxedly connected to saidwall, a doatin bellows head to which the opposite end og the bellows isconnected, means for guiding the reciprocation of said bellows head,means `connecting the bellowshead and needle valve, a spring tending toexpand said bellows and to open said needle valve, a second bellowssurrounding the needle valve and connected at one end to said bellowshead, a second spring tending to close said needle valve, and a thirdbellows surrounding said second spring, said second and third bellowsand said springs and needle valve being with the axial opening in theirst bellows.

2. ln combination a casing having a port, a needle valve controlling theport, a bellows within the casing .and subject to the pressure to becontrolled, said bellows having an axial opening and surrounding saidvalve' 3. In combination, a casing having a divi-A sion wall dividingthe vinterior of the casing into high and low pressure chambers, saidwall having a port, a ring bellows mounted in 'the low pressure chamber,a needle valve controlling said port and connected to said bellows, aspring of ixed resistance tending to open said kvalve against pressureexerted on said bellows, said valve being located within and at the axisof saidring bellows,

a second bellows surrounding the valve and sealing the interior of saidrst bellows, a spring bearing against and arranged lon'- gitudinally ofsaid valve and tending` to .l close said valve, and adjustable means-operable romthe exterior of said casing for `regulating the force ofsaidl vlast named spring.

4. In comblnation,

into high-and low pressure chambers, sai wall having a port, a ringbellows mounted a casing having a divii sion wall dividing the interiorof the'casingl thelow' pressure chambenfaA needle` valve controllingsaid port and connected to said 1 bellows, a spring of lixed resistancetending to opensaid valve against pressure exerted on said bellows, saidvalve being located within and at the axis of 'said` ring bellows, asecond bellows surrounding the` valve and Q sealing the interior of said-drst bellows, a springbearing against and arranged-longitudinally ofsaid valve and tending to close sai-d valve, a third bellows surroundingsaid spring, and adjustable means operable from the exterior of saidcasing or regulating the 'force oi said last named spring. 5. llncombination, a easing having a division'wall dividing the interior ofthe casing into high and low pressure chambers, sai

wall having a port, aring bellows mounted in the low pressure chamber, aneedle valve controlling said port and connected to said bellows, aspring o fixed resistance tending to open said valve against pressureexerted on said bellows, said valve being located within and at the axisof said ring bellows, a second bellows surrounding the valve and sealingthe interior of said rstbellows, a

spring bearing against and arranged longitudinally of said valve andtending to close said valve, a third bellows surrounding said spring,and adjustable means operable from the exterior of said casing forregulating the'orce of said last named spring, the axes of all saidbellows and said springs being controlling said port, a secondv valvefor controlling said port, a second spring bearing on the end of saidvalve and positioned in line therewith, said valve, said springs, saidsecond bellows and said guide sleeve being within the annular opening insaid first bellows and all said parts having a coinciding longitudinalaxis.

'7. In combination, a casing, a wall therein having a port, a fixedbellows support, a

bellows inthe form of an annulus having one end fixed to said support, abellows head to which the other end of said bellows is secured, a springinterposed 'between the support and head, a guide sleeve on which saidhead is guided, a second bellows held at one end in fixed relation andat the other end secured to said head, a needle valve for controllingsaid port, a second spring bearing on the end of said valve andpositioned in line therewith, and a third bellows surrounding saidsecond spring, all said bellows, said springs and said valve havingcoincident longitudinal axis.

8. In combination, a casing having a wall `providing a port, a bosssurrounding the port, a* bellows support having an annular flange and atubular portion threaded on said boss, a ring bellows secured` aton'e'end to said flange, a bellows head having an annular flange towhich the' opposite end of said bellows is secured, and a tubularportion, a sleeve depending from said boss and acting as a guide for thetubular portion of said head, a second bellows connectedat one end tosaid boss and at the other end to the tubular portion of said headwhereby to seal the interior" of said first bellows, a needle valvecontrolling said port and arranged axially of both said bellows, saidvalve having an end disc' cooperating with said head for movementtherewith, a spring aligned with said valve, a cap overlying said springand contacting said end disc, a third bel- 'lows connected to the cap atone end and to the casing at the other, and spring adjnsting meansoperable from the exterior of the casing.

9. In combination, a casing having a wall providing a port, a bellowssupport secured to said wall, said support having an annular portionarranged parallel/to said wall, a ring bellows secured atoiie end tosaid annuvalve controlling said port and arranged axially of both ofsaid bellows, means connecting said valve to said bellows head, andspring means acting on vsaid valve tending to close the same. 10. Incombination, a casing having a wall providing as port,` a bellowssupport secured to said wall, said` support having an annular portionarranged parallel to said wall, a ring bellows secured at one end tosaid annular portion, a bellows head having an annular portion parallelto the annular portion of said support, to which the opposite end ofsaid bellows is secured, said head having a tubular portion projectinginto theV center opening in said bellows, a sleeve projecting from saidwall and acting as a guide for said tubular portion, a second bellowsconnected to said sleeve, and at the other end to t lie tubular lportionof said head whereby to seal the interior of said firstbellows, a needlevalve controlling said port and arranged axially of both of saidbellows, means connecting said valve to said bellows head, and. springmeans, adjustable from the exterior of the casing, tending to seat thevalve.

11. In combination, a casing, the headV of which provides inlet andoutlet openings and a port, a cup depending from said head providing alow pressure chamber and symmetrical valve mechanism arranged in saidlow pressure chamber and comprising a ring bellows, a bellows supporthaving 'an upwardly extending tubular portion adaptedA for gas tightconnection to said head, a floating bellows head, a spring tending toexpand said bellows, a second bellows conchamber and comprising a ringbellows, a

bellows support having an upwardly extending tubular portion adapted forgas tight connection to said head, a floating bellows heal,v asprntending to expand said; bel- '.1ows5- 2m` secon bellows containedwithn'the center recess in said first bellows and serving x to Sealih'esame, a needle valve located at the gaxes of vsecl bellows and adaptedto control l Y s aid. port-means connecting saidneedlevalve i Y tosald-oating head, aspring actngverti- `cally omy said .valve :mtladjustablefrom the. ,o 1 exterior-ofthe casing, and af-thirdbellows i Y-3:10 fnelos" ng Seid named spring and sealing f "ftheinterofjof saideasing froml outside air. rflljlgrte'stilnony whereof I have axed my

